- Define UserPreferenceEntry, FavoriteEntry schemas in spec/identity
- Define IUserPreferencesService and IUserFavoritesService contracts
- Implement ObjectQL-based persistence adapter
- Create UserPreferencesServicePlugin
- Define REST API routes for preferences and favorites

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- Add UserPreferencesServicePlugin to Studio server bootstrap
- Add auto-registration in CLI serve command
- Add service to Studio mock kernel for testing
- Add workspace dependency to Studio package.json

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- Test all IUserPreferencesService methods (get, set, setMany, delete, getAll, has, clear, listEntries)
- Test UserFavoritesService (add, remove, has, toggle, list)
- Test prefix filtering and multi-user isolation
- Test different value types (scalar, object, array, null)
- Use in-memory IDataEngine stub for fast unit tests

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- Add comprehensive README with usage examples and API reference
- Add CHANGELOG with v1.0.0 initial release notes
- Document all features, REST API routes, and schemas
- Include integration examples and best practices

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- Remove unused FavoritesValue and RecentItemsValue imports from contracts
- Update doc comment to use FavoriteEntry[] instead of FavoritesValue
- Keep imports minimal to avoid linting errors

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- Fix tsconfig.json to extend correct base config (tsconfig.json instead of tsconfig.base.json)
- Add .js extensions to all relative imports for ESM compatibility
- Fix unused variable warning in plugin.ts constructor
- Fix type error in objectql-preferences-adapter.ts for valueType field
- Fix test mock engine delete method to support $like operator
- Update pnpm-lock.yaml to include new service dependencies

All 25 tests now passing. Build successful.

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